Add campaign UTM links and piha.li shortener as a core helper.

Keep mint/UTM in always-on core so email_sms and directmail stay optional, and brand utm_source from SITE_NAME (or UTM_SOURCE) instead of a hardcoded client name.
Closes #3

site/email_sms/views.py

@@ -17,10 +17,12 @@ from django.views.decorators.http import require_GET, require_http_methods, requ
 
 from contacts.consent import opted_in_contacts, record_sms_stop
 from contacts.models import Channel
+from core.campaign_utm import ensure_campaign_utm_link, utm_panel_context
 from core.models import StoredFile
 from core.scheduling import parse_scheduled_for
 from email_sms.models import Campaign, Message, ProviderEvent
 from email_sms.services import (
+    channel_for_audience,
     create_campaign_draft,
     enqueue_campaign_send,
     message_is_removable,
@@ -291,6 +293,16 @@ def campaign_list(request):
             form_errors.append("Campaign name is required.")
         if audience not in Campaign.Audience.values:
             form_errors.append("Choose a recipient list.")
+        else:
+            channel = channel_for_audience(audience)
+            if channel in (Channel.EMAIL, Channel.SMS):
+                body = ensure_campaign_utm_link(
+                    body,
+                    name=name or "campaign",
+                    medium=channel,
+                    html=(channel == Channel.EMAIL),
+                )
+                form_data["body"] = body
         if not body:
             form_errors.append("Body is required.")
         if audience == Campaign.Audience.EMAIL_OPT_IN and not subject:
@@ -330,6 +342,7 @@ def campaign_list(request):
             "form_data": form_data,
             "form_errors": form_errors,
             "image_upload_url": reverse("email_sms:campaign_image_upload"),
+            **utm_panel_context(live=True),
         },
     )
 
@@ -353,6 +366,7 @@ def campaign_detail(request, pk):
             "recent_events": ctx["recent_events"],
             "events_title": ctx["events_title"],
             "events_empty": ctx["events_empty"],
+            **utm_panel_context(campaign=campaign, live=False),
             "can_send": campaign.status
             in {
                 Campaign.Status.DRAFT,